Conical paper cup and process for making the same



Dec. 7, 1926. 1,610,192 Y c BARBIERI CONICAL PAPER CUP AND PROCESS-FORMAKING THE SAME Filed Feb. 8, 1923 Patented Dec. 7, 192 6;

' UNITED STATES cnsaan Batten-m1, on NEW YORK, 1v. Y., assronon are runvon-rnx mm. 00., or Y cnroaeo, rumors, A conroaa'rron or rumors.

CONIGAI; PAPER CUP AN D PROCESS FOR MAKING THE SAME.

Application filed February 8, 1928. Serial No. 617,671.

This invention is forflan improvement in cups'of the type shown in therelssued Patent No. 15,381, granted June 22, 1922, to David F, Curtin.Cups of this type have hitherto been made of paper which 1s renderedwaterproof by being coated with paratfin, wax or other. suitablematerial; One objection to cups so made is that when packed in nestedform ,the paraflin is apt to soften under the action of a warm climateand cause the cups to adhere so that the nest becomes a united mass. Oneway of preventing this is illustrated in his Patent #1,413,460, grantedApril 18, 1922, but this way involves the use of an extra piece of paperand requires several additional operations in the process of making thecup.

It is an object of the present invention to produce a cup which can bestacked. in-a nest without danger of becoming attached tothe. other cupsin the nest.

It is a further object of the present in vention to'produce a cup ofpaper which is not coated, but is rendered waterproof in some other way.The usual kinds of adhesive,tsuch as glue and mucilage, cannot bereadily made .to adhere with certainty to water roofed paper. Whenpar'afiined paper is use and the cementitious material is meltedparafiin, it is necessary to keep the paper nearly, if not quite, to thepoint where the paraffin will liquefy in order to insure good unionbetween the overlapping parts of the cup. This invention contemplatesthe use of a cementitious material which, when but slightly heated, willadhere strongly to the waterproofed paper.

Cups made of paraflined paper according to the teaching of theabove-mentioned reissued patent are not very firmly joined along theoverlap or seam, so that a very little rough handling is sufficient tocause the .cup to unwrap. One reason for this is that the springinessofthe paper causes the outermost convo ution of the cup to come away-fromthe body of thecup ,while the cup is being formed. The clip is, formedby two revolvxing cones, one inside and one outside of the cup.' Thepressure of these cones against the paper blank is along one element ofthe comcalpaper cup. The paper cup revolves between the pressing cones.-This motion may be conveniently described by saying that the i elementof the cone'along which the pressure I of these rollers isapplied'travels around the paper cup. At the moment that thisftravel mgelement leaves the edge of the outer convolution, the part of thisconvolution between said edge and the rollers, trying to straightenltself, tends to lift this convolution from the cup. There is arelatively of makin the cup, the joint formed is not i very goo It isanother object of'the present invent1on to materially lessen the area ofthe paper which is tending to lift the outermost con- I I volution fromthe body of the cup, so that the lifting action will separate the outerconvolution less rapidly.- This will enable the pressing rollers toreapply their pressure before the separation is actually accomplishgdand thus a firm joint may be ob-v ,taine 1 It isa further object'of thisinvention to leave the edge of the outermost convolution free from thecup fora short distance so that a small area of the paper near the pointof the cu will spring a slight distance away from t e cup. The smallportion of lifted paper thus obtained will act as a-cushioning devicewhen the cupsare arranged in stacks and'so will keep the cups slightlyse arated from one another. from coalescing into a mass. Moreover, the

fact thatthe cups are made of waterproof paper which is not coated meansthat the iouter surface of the cup is not covered with a substancelikely to soften under warm cli- .matic conditions and so the tendencyof the cupsto become cemented together is avoided.

It is a further object of this inventionto apply cementitious materialto the blank from which the cup is formedin such a position that whenthe cup is formed-the desired free portion of'p aper will result, and,

'also in such a position that when the cementitious material spreadsunder the action of the pressing rollers it will assist in sealing thepoint of the cup;- v

It is a further 0 ject of this invention to form a' blank for a cup ofthe class described which shall permit the several results just Thisprevents t e cups described to be accomplished without requiring'anyundue accuracy of manipulation.

. It is a further object of this invention to apply the cementitiousmaterial in .the form of a patch with a recess therein which willaccommodate the grippers that handle the blank in making the cup.

It is a further object of this invention to so position said recess thatthe diminished area of cementitious material will occur on 'which thecupis formed.

As shown on the drawings:

The cup consists of a cone 10, made by coiling up-a blank so that it hasan overlap or seam which presents an outer edge 11 and an inner edge 12.The outer'edge 11, as is best seen in Figure 2, winds about the cup, butthe inner edge, as seen in Figure 3, is only slightly curved and isnearly coincident with an element of the cone.

The blank from which the cup is made has an arcuate edge 13 which makesthe mouth of the cup and a very nearlyradial slightly curved edge 14which appears in the finished cup as the inner edge 12 of the seam. Theedge 14 converges with the other straight and stands at .'a

seam-forming edge 15. The other converg- Q ing edge 15 of the blank isapproximately considerable angle with the radius to its outer end, Theinner end of the edge 15 merges'with the curved edge 16 of a projection.I The edges 16 and 1-5 combine to make the outer edge 11 of the seam, asshown in Figure 2. Where the edge 16 merges with the edge .15, thestraight line 15 is. approximately tangential to the curve 16, so thatno abrupt change in direction occurs. From this merging point 17 to apoint'18,'rather more than a quarter of a circumference away, the curve16 is of approximately con stant radius, and from-the point 18 to themeeting of the projection with the edge 14 the edge 16 is again ofapproximately constant radius, but this radius is smaller than that ofthe first-described-part of the curve 16, so that the periphery of theprojection as a whole has a curved edge whose. radius ofcurvatureincreases as we. go from the edge 14 to the edge 15.

The curved edge 16 'meetsthe curved edge It at a point 19, the'twocurves making a very gacute angle with each other. .In fact,

sitethat part of the curve they may very well have a common tangent atthis point, which would have the direction indicated by the broken lineto the point a. This character of the meeting point of the edges 14 and16 is represented, when the blank is made in a commercial way by cuttingwith a die, by a slit or cut extending for a short distance inward fromthe meeting point of the edges and so narrow that J it is made by asingle cutting edgein the die.

The blank is made of paper which is waterprooied by being impregnatedwith wax, paraflin solution, or some other waterproofing agent. Thewaterproofing agent, however, is not coated onto the outer surfaces ofthe paper. but is embodied into the material of the paper itself. Thepaper surface is left with so little parafiin, wax or other likesubstance that it cannot be rendered adhesive by merely heating it.

cementitious material of a kind which will unite with the waterproofedpaper when The seam is united by means of an adhesive or other heated,although *when cold it .acts as do most adhesives when applied toparafiined paper, gathering into globules instead of uniting with thesurface.

Adhesive is applied to th? blank by means of a die or other suitablemechanism in a patch of the form illustrated at 20. Preferably thecentral part of the area to be outlined by the adhesive is leftuncovered so that the adhesive is in the form of a patch which surroundsan area 21 of nonadhesive paper. One edge 22 ofthe patch of adhesive isapproximately parallel to the radius loo which separates thesector-shaped main body of the blank from the part that extends beyondthis sector. The edge 23 of the patch of adhesive material is at anangle with the edge 22 and extends approximately parallel to thestraight part 15 of the non-radial edge of the blank. Opposite the point17, where the straight edge 15 merges with the curved edge 16, theadhesive patch also has a curve in its edge so as to keep themarginbetween the cementitious material and the edge of the blank ofapproximately constant. width. The patch follows the curve of the blankthroughout, except as noted below, so that this margin is ofsubstantially constant width with these exceptions.

The first exception is that a bay 24 is left in.the atch oi5cementitious materia'l'to accommo ate the grippers whichmust grasptheblank when it is being formed into a cup and which must not becomecovered with the cementing material. This bay is oppo- 16 which liesdiametrically opposite the middle portion of the curved edge 13. i

A third variation in the size of the gin is found at the point 19 whereh 14 and 16 come together. This. I be the apex'of the cup, and is ialong -a single line at a time, but this line paraffin, wax or othermaterial that will be-v till forming rollers upon the blank at the mo- 1to-occu'r.

' line 0 are superposed upon each other and cause it occurs in theintermediate convblu- 9' curvature of the edge 13. The 'cementitio'usbut not quite to the-edge-of theblank. "-At material approaches muchnearer to this the point '*som e little width of paper will point thanit does 'to any other part of the be left uncemented. In the finished"cup,

' edge of the blank. this makes a portionthat does not lie down 5 Informing the blank into a cup, it is flat a ainstthe body of the cup, butstands coiled or rolled 111 0 1 itself, as is clearly seen slight yraised. therefrom due to the resili- K from Figures 1 and 2. The coilingor formence or stiflness of the paper. This gives a ing is done by twoconical rollers acting slight springy projection at thepoint of the Iupon the blank, one within and one without. cup so. that when the cupsare nested they 10, the cup. These rollers rotate and so cause cannotfit too closelyin contact with one anthe cup to rotate between'them'. Itwill'be e other. Th'e-likelihood of the cups adhering obvious,therefore, that the two forming to one anothe-rwhile "in nested form isthus rollers contact the blank upon an element very materially lessenedThe fact that the of the cone. Pressure is applied to the cup..outersurface oftlie cup is not coated with includes a number of linesupon the blank come adhesive in a warm climate also assists because thecup is made. up of superposed "in preventing the adhesion of thecups-in. convolutions; Thus in Figure 4 the line a nested form.) Thesetwo factors together represents the location of the pressure of therender such adhesion exceedingly unlikely "menathat the last of theprojection 16 is just The bay 24 left in the patch of adhesive escapingfrom the pressing rollers. The promaterial 1n order .to accommodate thegripjection 1s, however, wound about the cup so pers of the machinedoes' not materially that at the same moment the line-b and the lessenthe strength of the resulting. cup-be upon the line a and are eachreceiving prestion and not in either the. interior or ex-- sure at thisinstant. The portion .of the terior one. Consequently the portion of theblank between the lines a and b constitutes cup which is left with lessadhesive because the innermost convolution of the cup.-' The of thisbay-is reinforced bothinside and 'outportion of the blank between thelines 1) side with other convolutions which have and a. constitutes theintermediate convoluabundant adhesive. I 4 tion, and the portion of theblank between The cup which results from this method line .0 and theextremity of the projec-' of manufacture is capable of withstanding tionconstitutes the outermost convolution. much more rough treatment thancups here- I It will be observed that the portion between tofore madebecause of the firm character of the lines I) and 0 when the cup isfprmed, the seam. 'ThlS firm character is.- due, at

is between the converging ends of-the two least in art, to the fact thatonly the por- .edges 14 and 16 and so assists in-closin the tion of t eblank between the line .0 and the I cup at the point 19; The pressure -0the upperend of the projection assh'own in ;forming rollers against theoverlapping part Figure 4 will yieldto the springing action-of 1 v ofthe blank will cause the cementitious mathe paper when thejrollers passoflf of the 'terial to flow somewhat so that it will ap-v edge'of theprojection. 'A considerable por- Proach the edge of the blank, but at notion ofthe area of this portion'constitutes point except :19- will itactually reach the "that part of the outer convolution which is edge. Atthe point 19 the adhesi've'material not fastened in the finished cup.The spring- 1 will assist in sealing" the apex of the cup. ing characterof this. part does notten'd to I Because'the angle between the eurves 16and. diminish the strength of. the joint and the re-' 14 at this pointis very small so that it pracmainder'of said'portion bein a small areatically forms a mere split, a considerable of paper acts only very slowyagainst the obstacle is presented to the flow of adhesive holdingactionof the adhesive. 'The cup is throu h the cupat its apex. The part of theI rapidly rotated by therollers. Consequently 7 blank etween the linesI) and c and near the he Pressure of h rollers g t the P point 19 iscrowded into the slit between the tion 25 of the parts of adhesiveisrepeated ends of the edges 14 and 16 and so makes before the paper in;its straightening or I a tight joint through-which .the adhesivespringing actioii has hadti'me to pull the 3 eannot easily get. For thisreason, even joint apart. ,Therefore, the joint receives when theoutlineof the blank and the posirepeated pressure while the effect ofthe tion of the parts with cementitious material first pressure is stillpresent. The paper is thereon vary slightly, as they do in manuthereforeheld in the roper conical form facturing, it will stillbe, unusual forany long enough for the-joint to effectively set. .c ementitlousmaterial to appear on the ex- Moreover, vall of the adhesive between theterior of the cup. I 'lines' I) and 0 and all of, the adhesive be-'Alongalmost allofthe margin the flow tween line b and the left of.FigureA-marem; of the cementitious'material under the prespermanentlyheld in place during the whole sure .will cause the material to comenearly of the action of the rollers so that all but 3 f a very smallpart of the adhesive .has

had a chanceto firmly set-before the action of the rollers is ended.

g I am aware that numerous details of construction may be varied througha Wlde range "without departing from the .princi-' ples of thisinvention, and I therefore do not purpose limiting the patent granted 7otherwise than necessitated by the prior art.

v lapping convolutions, the outer convolution having near the point ofthe cone a margin free from cementi-tious material whereby said marginis free to spring outward from the cup. a

3, A conical paper cup having convolutions, the outermost convolution,extending less distance from the point than those within and being freefrom the body of the cup for a fraction of a turn.

4. A conical paper cup having convolutions. and an outwardly springingpaper projection adjacent the point whereby when nested said cups areresiliently held apart.

5. The method of forming a-paper cup which consists in shaping a blankfrom noncoated waterproof paper, applying a cementitious material to oneface of the parts of said blank which are intended to overlap, saidapplied material. notextending to the edgesof the blank, forming theblank into a convoluted conical cup, exerting pressure on theoverlapping parts of the cup whereby the cementitiou's material isforced towards but not beyond the edges of said;

blank, and permitting the uncemented margin portion near the springaway.

6. The method of forming a paper cup which consists-in shaping a blankfrom 11011? coated water-proof paper, applyin point of the cup tomentitious material which will ad ere to a said paper only when heated,to one faceof the parts of said blank which are intended to. overlap,said applied material not extending to the edges of the blank, formingthe blank into a convoluted conical cup, exerts ing pressure on theoverlapping parts ofthe cup by heated tools whereby the cementitiousmaterial is caused to adhere to the 1paper and is forced towards but notbeyondt e edge of said blank, and permitting the uncemented marginportion near the spring away.

point of the cup to' 7. The method of forming a. conical cup betweenrollers which consists in applying cementitious material to the parts ofthe paper blank intended to overlap, said application stopping short ofthe edge of said parts, rolling the blank into a cone with I oEsAnnBABBIERI.

